Analog Devices Inc./Maxim Integrated ZLR323S2832GR562PT

Overview

ZLR323S2832GR562PT from Maxim Integrated is an 8-bit ROM-based microcontroller optimized for infrared remote control systems, featuring 32 KB ROM, 237 B RAM, 28-pin SOIC package, 2.0–3.6 V operation, and dual counter/timers (8-bit + 16-bit) with IR pulse generation/reception logic. It integrates on-chip comparators, low-voltage detection, and STOP mode consuming 1.4 µA typical - deployed in battery-powered universal remote controls.

For engineers reviewing the ZLR323S2832GR562PT datasheet, ZLR323S2832GR562PT pinout, ZLR323S2832GR562PT application, or ZLR323S2832GR562PT equivalent, key selection criteria include IR waveform timing accuracy, mask-programmable pull-up configuration per port nibble, STOP-mode wake-up via Port 2 edge detection, and comparator reference input routing through Pref1/P30 and P33.

Technical Context

The ZLR323S2832GR562PT implements a Z8®-core architecture with Expanded Register File (ERF) enabling direct access to timer control registers (CTR0–CTR3 in ERF Bank D), comparator configuration (P3M, CTR1), and stop-mode recovery registers (SMR, SMR2). Its IR-specific peripherals include programmable input glitch filtering, dual capture/load registers per timer, and dedicated Port 3 outputs (P34–P37) for T8/T16 waveform routing.

Power management is hardware-assisted: STOP mode disables comparators and clocks while retaining RAM and register state; HALT mode halts CPU but maintains peripheral clocks; low-voltage detection triggers interrupt IRQ5 with flag LVD(D)0CH. All I/O ports retain CMOS input buffers regardless of direction, requiring external biasing or software-controlled low-state enforcement during STOP to prevent leakage >100 µA.

Key Specifications

Pinout & Package

Package: 28-pin SOIC (Small Outline Integrated Circuit), 300 mil width, JEDEC MS-012AC compliant. Pin pitch: 1.27 mm. Thermal pad not present. RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar infrared microcontroller applications.

Compared with ZLR323S2032GR562PT, the ZLR323S2832GR562PT provides 8 additional I/O pins and Port 2 edge-detect wake-up - critical for feature-rich remotes. Versus ZLR323S4832GR562PT, it offers optimal cost/size balance for mid-tier IR controllers without over-provisioning.

Availability

ZLR323S2832GR562PT is available at Aetrix Electronics and suitable for universal remote controls, smart home IR bridges, HVAC thermostats, and automotive keyless entry transmitters requiring stable component supply across multi-year production cycles.

Supply support for ZLR323S2832GR562PT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, medical, communications, and consumer applications.

The Crimzon® ZLR32300 product line was engineered specifically for infrared remote control systems, integrating ROM-based protocol stacks, ultra-low-power timers, and comparator-based signal conditioning to replace discrete IR encoder/decoder solutions.

FAQ

What is the maximum ROM capacity supported by ZLR323S2832GR562PT?

ZLR323S2832GR562PT supports up to 32 KB of mask-programmed ROM. This capacity is fixed at manufacturing and cannot be field-updated. The ROM contains the application firmware, interrupt vectors, and protocol libraries required for infrared remote control functionality. All ZLR323S2832GR562PT units ship with fully programmed 32 KB ROM.

Does ZLR323S2832GR562PT support in-circuit programming or firmware updates?

No, ZLR323S2832GR562PT does not support in-circuit programming or field firmware updates. It uses mask ROM technology, meaning the program code is permanently embedded during semiconductor fabrication. Firmware changes require ordering a new mask revision and associated NRE charges. Development relies on pre-production samples with finalized code.

How is wake-up from STOP mode implemented on ZLR323S2832GR562PT?

ZLR323S2832GR562PT wakes from STOP mode exclusively via edge detection on Port 2 pins (P20–P27), configured through the SMR register. P20 is the primary wake source, supporting both rising and falling edge detection. Comparators and external interrupts (e.g., P31/P32) are disabled in STOP mode and cannot trigger wake-up unless explicitly reconfigured in DIGITAL mode prior to entry.

What are the valid crystal or resonator frequencies for ZLR323S2832GR562PT?

ZLR323S2832GR562PT supports parallel-resonant crystals or ceramic resonators at 32.768 kHz (for real-time clock functions) and 455 kHz (for standard IR carrier generation). The oscillator circuit is designed for fundamental-mode operation only; overtone crystals are not supported. External single-phase clock input is also accepted at XTAL1, but must meet AC timing specifications in the datasheet.

Can Port 1 be used on ZLR323S2832GR562PT in the 28-pin package?

No, Port 1 (P10–P17) is reserved and non-functional in all 20-pin and 28-pin packages of the ZLR32300 family, including ZLR323S2832GR562PT. Writes to Port 1 registers have no effect, and reads always return 0xFF. Port 1 is only available in the 48-pin SSOP variant (e.g., ZLR323S4832GR562PT) and is not accessible on this part.